/* Copyright  2009
   @Author
   Richard Changde Yin            e-mail yinchangde@hotmail.com

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
   
/**
 * @filename: str_conv.cc
 */ 
#include <server_includes.h>
#include CSTDINT_H
#include <function/str/str_conv.h>

String *Item_str_conv::val_str(String *str)
{
  assert(fixed == 1);
  String *res;
  if (!(res=args[0]->val_str(str)))
  {
    null_value=1; /* purecov: inspected */
    return 0;     /* purecov: inspected */
  }
  null_value=0;
  if (multiply == 1)
  {
    uint32_t len;
    res= copy_if_not_alloced(str,res,res->length());
    len= converter(collation.collation, (char*) res->ptr(), res->length(),
                                        (char*) res->ptr(), res->length());
    assert(len <= res->length());
    res->length(len);
  }
  else
  {
    uint32_t len= res->length() * multiply;
    tmp_value.alloc(len);
    tmp_value.set_charset(collation.collation);
    len= converter(collation.collation, (char*) res->ptr(), res->length(),
                                        (char*) tmp_value.ptr(), len);
    tmp_value.length(len);
    res= &tmp_value;
  }
  return res;
}

void Item_func_lcase::fix_length_and_dec()
{
  collation.set(args[0]->collation);
  multiply = collation.collation->casedn_multiply;
  converter= collation.collation->cset->casedn;
  max_length= args[0]->max_length * multiply;
}

void Item_func_ucase::fix_length_and_dec()
{
  collation.set(args[0]->collation);
  multiply  = collation.collation->caseup_multiply;
  converter = collation.collation->cset->caseup;
  max_length= args[0]->max_length * multiply;
}

